Comment Not quite as old school as Old School (Score 1) 285
Took along my TI-99/4A with about 150 cartridges and an MBX system to Christmas with my family. My two nephews, 7 and 13, got neat new electronica, including a Nintendo DS. They spent most of the day on the TI playing "Championship Baseball" and "Frogger," amongst other games in the collection. They really thought the speech recognition of the MBX was cool, though not perfect.
Why not start them with what you started with, and explain to them your evolution? Maybe even demonstrate it if you can: I have my TI, my Commodore 64, and my Amiga which I can show to them. I can even show them early Macs and Ataris (8-bit and ST) like I got to use in school. It believe it's helpful for them to know from where the technology they use today came.
While I lament that the card-swappers of today don't know so much about the chip-swapping I did (though things like the Arduino and BASIC Stamp certainly help,) I am sure that some of my own elders lament that I never knew what it was like to solder a diode into a CPU to create a new instruction.